nemo judex in causa sua
C2CEFR level
96/100Rarity: very rare
TechnicalRegister
The rule that no one may be a judge in their own cause, requiring an impartial decision-maker.
Because the chairman had a financial interest, the decision offended nemo judex in causa sua.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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